PulPac is developing a new generation of fibre-based caps, using its dry-moulded fibre technology.

The caps will be revealed publicly for the first time at the interpack 2026 trade fair, scheduled to take place on 7–13 May in Düsseldorf, Germany.

Targeting one of the most widely used plastic parts in everyday packaging, the initiative aims to support a shift toward more material-aligned packaging systems.

The new caps are designed to match the functional and consumer expectations of plastic alternatives while moving to a fibre-based solution.

Early tests show “promising” performance in thread engagement, opening and closing, sealing architectures and overall tactile experience, according to the company.

The design also allows a high degree of flexibility, including differentiation between the inside and outside of the cap.

The development is being carried out with PA Consulting and in close dialogue with industry stakeholders, including Optima, PulPac’s designated machine partner for this segment.

It builds on work within the Bottle Collective initiative, where complete fibre-based bottle systems, including closures, are being evaluated with several global brand owners and packaging players.

Early versions of the caps have already been produced and tested in real-life packaging and bottle applications.

PulPac chief technology officer Charlotte Walldal said: “At PulPac, we focus on creating value both in what can be realised today and what comes next in packaging. Advancing fibre-based caps is a natural step in that journey.”

Last year, SIG partnered with PulPac to develop paper-based closures for its aseptic cartons.